21002101022 has 64 divisors (see below), whose sum is σ = 39312683520. Its totient is φ = 8214441984.

The previous prime is 21002100997. The next prime is 21002101033. The reversal of 21002101022 is 22010120012.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21002100994 and 21002101012.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 822398 + ... + 847550.

It is an arithmetic number, because the mean of its divisors is an integer number (614260680).

Almost surely, 2^21002101022 is an apocalyptic number.

21002101022 is a deficient number, since it is larger than the sum of its proper divisors (18310582498).

21002101022 is a wasteful number, since it uses less digits than its factorization.

21002101022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25297.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 21002101022 its reverse (22010120012), we get a palindrome (43012221034).

The spelling of 21002101022 in words is "twenty-one billion, two million, one hundred one thousand, twenty-two".